Put 32,000 miles on my 1978 Honda CX500 I purchased new the two years I owned it and before it was stolen...no problems at all with it.
Put 85,000 miles on my 1980 Yamaha XS1100 I bought new...no problems at with it the 15 years I owned it.
Have put 46,000 miles on my 2002 Triumph Bonneville America I purchased new...not a problem at with it...nope, not even with the CDI unit nor the speedometer nor the starter idler brace, which has seemed to be bugaboos with some owners around here over the years.
And now on the flip-side...
My 1966 BSA 650 Lightning which I purchased used in 1968 suffered the classic "Prince of Darkness" blues in 1970...yep, as they say "the smoke escaped from the wiring loom".
My 1971 BSA 750 Rocket-3 purchased new suffered a sheered valve lifter and which ended up going through the bottom end and fragging the engine's cylinder barrel bottoms and piston skirts just a little over a year after I purchased it and thus after its warranty period was over...ended up rebuilding the engine myself.
Thank goodness for that Haynes workshop manual I bought...

(...OOPS, almost forgot...when Triumph first arrived back into the states in '95, I purchased a new 900 Sprint...in 2009 the starter's sprag clutch gave up the ghost, and thus the bike wouldn't start...it sat in my garage until about 5 months ago and when I sold it for a song to a guy I've met here in Sedona who owned a '96 Trident when he lived in Germany and who still has a soft spot in his heart for those early Hinckley triples...he presently owns a 1999 Moto Guzzi Centauro, and tours with his wife on a Victory Vision)